In early September, Replit embarked on a project to enhance its stability and performance amid rapid growth, tackling issues such as high latency and connection failures. Despite initial challenges, including increased latency and connection issues with their legacy Classroom product, the team made significant improvements by optimizing Postgres connections, caching frequently queried objects, and implementing rate limits. These efforts resulted in reduced latency, with the 99th percentile time for loading a repl decreasing from over two minutes to 10-15 seconds, and improved connection success rates to 99.5%. Additionally, the frequency of a stressful reconnection prompt dropped from 2.81% to 1.5%, with further reductions anticipated. Overall, the initiative aimed to address fundamental bottlenecks rather than just immediate symptoms, ensuring a more reliable and faster experience for users.